Question

我有ListView。最初，ListView包含一些数据。当用户点击某个项目时，另一个布局将动态添加到该项目中，因此它的高度将会增加。

现在，当项目的高度增加时，它会立即显示修改后的项目。但是，我想要的是动画，以便逐渐增加项目的高度。

Answer 1

我认为我正在寻找与被问到的相同的内容，我正在寻找一种方法来动画扩展listview项目，因为显示了一些新内容（我只是在{{1}更改某些视图的可见性到GONE）。我曾使用VISIBLE的答案来帮助我应用翻译动画（我不想要旋转动画）：

mirroredAbstraction

到每个视图。它创造了一个很好的效果，但仔细观察，listview项目实际上突然扩展到所需的整个大小，然后动画将视图放到位。但我想要的是当视图进入可见性时，listview项目的效果会逐渐降低。

我找到了我在这里寻找的东西： expanding-listview-items

博主有一个指向他的github示例的链接，在这里： ExpandAnimationExample

如果您发现这些网站不见了，请通知我，我会提供我的副本。

他对内容提出了负面影响，以便提高知名度，并为<translate xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/linear_interpolator" android:fromYDelta="0" android:toYDelta="-100%p" android:duration="500" />设置可见性：

GONE

并写了一个操纵底部边距的动画：

android:layout_marginBottom="-50dip"

它看起来非常好。我找到了他对这个问题的回答（可能重复？）问题：

Adding animation to a ListView in order to expand/collapse content

另外，如果你知道另一种做同样事情的方法，请告诉我。

Answer 2

我已经实现了一个适用于所有Android sdk版本的简单代码。

见下面的工作和代码。

Github代码：https://github.com/LeonardoCardoso/Animated-Expanding-ListView

有关我网站的信息：http://android.leocardz.com/animated-expanding-listview/

normal accordion

基本上，您必须创建自定义TranslateAnimation和自定义列表适配器，并且在设置动画时，您必须更新listview项的当前高度并通知适配器此更改。

我们来看看代码。

列出项目布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:id="@+id/text_wrap"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:orientation="horizontal"
       android:paddingBottom="@dimen/activity_vertical_margin"
       android:paddingLeft="@dimen/activity_horizontal_margin"
       android:paddingRight="@dimen/activity_horizontal_margin"
       android:paddingTop="@dimen/activity_vertical_margin" >

       <TextView
           android:id="@+id/text"
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
           android:textSize="18sp" >
       </TextView>

</LinearLayout>

活动布局

   <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
          xmlns:tools="http://schemas.android.com/tools"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          tools:context=".MainActivity" >

          <ListView
              android:id="@+id/list"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:divider="@android:color/black"
              android:dividerHeight="3dp" >
          </ListView>

      </RelativeLayout>

列出项目类

public class ListItem {

private String text;
private int collapsedHeight, currentHeight, expandedHeight;
private boolean isOpen;
private ListViewHolder holder;
private int drawable;

public ListItem(String text, int collapsedHeight, int currentHeight,
        int expandedHeight) {
    super();
    this.text = text;
    this.collapsedHeight = collapsedHeight;
    this.currentHeight = currentHeight;
    this.expandedHeight = expandedHeight;
    this.isOpen = false;
    this.drawable = R.drawable.down;
}

public String getText() {
    return text;
}

public void setText(String text) {
    this.text = text;
}

public int getCollapsedHeight() {
    return collapsedHeight;
}

public void setCollapsedHeight(int collapsedHeight) {
    this.collapsedHeight = collapsedHeight;
}

public int getCurrentHeight() {
    return currentHeight;
}

public void setCurrentHeight(int currentHeight) {
    this.currentHeight = currentHeight;
}

public int getExpandedHeight() {
    return expandedHeight;
}

public void setExpandedHeight(int expandedHeight) {
    this.expandedHeight = expandedHeight;
}

public boolean isOpen() {
    return isOpen;
}

public void setOpen(boolean isOpen) {
    this.isOpen = isOpen;
}

public ListViewHolder getHolder() {
    return holder;
}

public void setHolder(ListViewHolder holder) {
    this.holder = holder;
}

public int getDrawable() {
    return drawable;
}

public void setDrawable(int drawable) {
    this.drawable = drawable;
}
}

查看持有人类

public class ListViewHolder {
 private LinearLayout textViewWrap;
 private TextView textView;

 public ListViewHolder(LinearLayout textViewWrap, TextView textView) {
    super();
    this.textViewWrap = textViewWrap;
    this.textView = textView;
 }

 public TextView getTextView() {
        return textView;
 }

 public void setTextView(TextView textView) {
    this.textView = textView;
 }

 public LinearLayout getTextViewWrap() {
    return textViewWrap;
 }

 public void setTextViewWrap(LinearLayout textViewWrap) {
    this.textViewWrap = textViewWrap;
 }
}

自定义动画类

    public class ResizeAnimation extends Animation {
    private View mView;
    private float mToHeight;
    private float mFromHeight;

    private float mToWidth;
    private float mFromWidth;

    private ListAdapter mListAdapter;
    private ListItem mListItem;

    public ResizeAnimation(ListAdapter listAdapter, ListItem listItem,
            float fromWidth, float fromHeight, float toWidth, float toHeight) {
        mToHeight = toHeight;
        mToWidth = toWidth;
        mFromHeight = fromHeight;
        mFromWidth = fromWidth;
        mView = listItem.getHolder().getTextViewWrap();
        mListAdapter = listAdapter;
        mListItem = listItem;
        setDuration(200);
    }

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        float height = (mToHeight - mFromHeight) * interpolatedTime
                + mFromHeight;
        float width = (mToWidth - mFromWidth) * interpolatedTime + mFromWidth;
        LayoutParams p = (LayoutParams) mView.getLayoutParams();
        p.height = (int) height;
        p.width = (int) width;
        mListItem.setCurrentHeight(p.height);
        mListAdapter.notifyDataSetChanged();
    }
  }

自定义列表适配器类

public class ListAdapter extends ArrayAdapter<ListItem> {
private ArrayList<ListItem> listItems;
private Context context;

public ListAdapter(Context context, int textViewResourceId,
    ArrayList<ListItem> listItems) {
super(context, textViewResourceId, listItems);
this.listItems = listItems;
this.context = context;
}

@Override
@SuppressWarnings("deprecation")
public View getView(int position, View convertView, ViewGroup parent) {
ListViewHolder holder = null;
ListItem listItem = listItems.get(position);

if (convertView == null) {
    LayoutInflater vi = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    convertView = vi.inflate(R.layout.list_item, null);

    LinearLayout textViewWrap = (LinearLayout) convertView
            .findViewById(R.id.text_wrap);
    TextView text = (TextView) convertView.findViewById(R.id.text);

    holder = new ListViewHolder(textViewWrap, text);
} else
    holder = (ListViewHolder) convertView.getTag();

holder.getTextView().setText(listItem.getText());

LayoutParams layoutParams = new LayoutParams(LayoutParams.FILL_PARENT,
        listItem.getCurrentHeight());
holder.getTextViewWrap().setLayoutParams(layoutParams);

holder.getTextView().setCompoundDrawablesWithIntrinsicBounds(
        listItem.getDrawable(), 0, 0, 0);

convertView.setTag(holder);

listItem.setHolder(holder);

return convertView;
}

}

主要活动

public class MainActivity extends Activity {

private ListView listView;
private ArrayList<ListItem> listItems;
private ListAdapter adapter;

private final int COLLAPSED_HEIGHT_1 = 150, COLLAPSED_HEIGHT_2 = 200,
    COLLAPSED_HEIGHT_3 = 250;

private final int EXPANDED_HEIGHT_1 = 250, EXPANDED_HEIGHT_2 = 300,
    EXPANDED_HEIGHT_3 = 350, EXPANDED_HEIGHT_4 = 400;

private boolean accordion = true;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

listView = (ListView) findViewById(R.id.list);

listItems = new ArrayList<ListItem>();
mockItems();

adapter = new ListAdapter(this, R.layout.list_item, listItems);

listView.setAdapter(adapter);

listView.setOnItemClickListener(new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> parent, View view,
            int position, long id) {
        toggle(view, position);
    }
});
}

private void toggle(View view, final int position) {
ListItem listItem = listItems.get(position);
listItem.getHolder().setTextViewWrap((LinearLayout) view);

int fromHeight = 0;
int toHeight = 0;

if (listItem.isOpen()) {
    fromHeight = listItem.getExpandedHeight();
    toHeight = listItem.getCollapsedHeight();
} else {
    fromHeight = listItem.getCollapsedHeight();
    toHeight = listItem.getExpandedHeight();

    // This closes all item before the selected one opens
    if (accordion) {
        closeAll();
    }
}

toggleAnimation(listItem, position, fromHeight, toHeight, true);
}

private void closeAll() {
int i = 0;
for (ListItem listItem : listItems) {
    if (listItem.isOpen()) {
        toggleAnimation(listItem, i, listItem.getExpandedHeight(),
                listItem.getCollapsedHeight(), false);
    }
    i++;
}
}

private void toggleAnimation(final ListItem listItem, final int position,
    final int fromHeight, final int toHeight, final boolean goToItem) {

ResizeAnimation resizeAnimation = new ResizeAnimation(adapter,
        listItem, 0, fromHeight, 0, toHeight);
resizeAnimation.setAnimationListener(new AnimationListener() {

    @Override
    public void onAnimationStart(Animation animation) {
    }

    @Override
    public void onAnimationRepeat(Animation animation) {
    }

    @Override
    public void onAnimationEnd(Animation animation) {
        listItem.setOpen(!listItem.isOpen());
        listItem.setDrawable(listItem.isOpen() ? R.drawable.up
                : R.drawable.down);
        listItem.setCurrentHeight(toHeight);
        adapter.notifyDataSetChanged();

        if (goToItem)
            goToItem(position);
    }
});

listItem.getHolder().getTextViewWrap().startAnimation(resizeAnimation);
}

private void goToItem(final int position) {
listView.post(new Runnable() {
    @Override
    public void run() {
        try {
            listView.smoothScrollToPosition(position);
        } catch (Exception e) {
            listView.setSelection(position);
        }
    }
});
}

private void mockItems() {
listItems
        .add(new ListItem(
                "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.",
                COLLAPSED_HEIGHT_1, COLLAPSED_HEIGHT_1,
                EXPANDED_HEIGHT_1));

listItems
        .add(new ListItem(
                "Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.",
                COLLAPSED_HEIGHT_2, COLLAPSED_HEIGHT_2,
                EXPANDED_HEIGHT_2));

listItems
        .add(new ListItem(
                "Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.",
                COLLAPSED_HEIGHT_3, COLLAPSED_HEIGHT_3,
                EXPANDED_HEIGHT_3));

listItems
        .add(new ListItem(
                "Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo.",
                COLLAPSED_HEIGHT_2, COLLAPSED_HEIGHT_2,
                EXPANDED_HEIGHT_4));

listItems
        .add(new ListItem(
                "At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga.",
                COLLAPSED_HEIGHT_1, COLLAPSED_HEIGHT_1,
                EXPANDED_HEIGHT_4));

listItems
        .add(new ListItem(
                "Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus.",
                COLLAPSED_HEIGHT_2, COLLAPSED_HEIGHT_2,
                EXPANDED_HEIGHT_4));

listItems
        .add(new ListItem(
                "Temporibus autem quibusdam et aut officiis debitis aut rerum necessitatibus saepe eveniet ut et voluptates repudiandae sint et molestiae non recusandae.",
                COLLAPSED_HEIGHT_3, COLLAPSED_HEIGHT_3,
                EXPANDED_HEIGHT_3));

listItems
        .add(new ListItem(
                "Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.",
                COLLAPSED_HEIGHT_1, COLLAPSED_HEIGHT_1,
                EXPANDED_HEIGHT_4));

    }

}

Answer 3

使用价值动画制作解决方案看起来不错：

ValueAnimator animator = ValueAnimator.ofInt(100, 300);
animator.setDuration(1000);
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
  @Override
  public void onAnimationUpdate(ValueAnimator animation) {
    listViewItem.getLayoutParams().height = (Integer) animation.getAnimatedValue();
    listViewItem.requestLayout();
  }
});
animator.start();

刚刚阅读了android开发者指南，值得一读：http://developer.android.com/guide/topics/graphics/prop-animation.html

但请记住，requestLayout（）处理很重要。因为requestLayout（）的一次调用会使视觉受影响的每个附近元素重新计算它的布局。使用负底边距（将元素的某些部分隐藏在另一个边框下）并使用以下内容显示它可能更好：

listViewItem.setTranslationY((Integer) animation.getAnimatedValue());

当然，您可以仅设置底部边距，就像在此问题的另一个答案中提出的那样。

Answer 4

您必须在Adapter ListView中实施动画以实现您想要的效果，

首先创建一个基本的animation.xml文件，在res文件夹中创建一个名为anim的文件夹，然后将animation.xml文件放入其中。

例如我创建了一个名为rotate_animation.xml的示例动画

<?xml version="1.0" encoding="UTF-8"?>
<rotate
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:fromDegrees="0"
    android:toDegrees="360"
    android:pivotX="50%"
    android:pivotY="50%"
    android:duration="400" />

然后像这样创建Animation Object的实例

private Animation animation;

然后在Adapter实现的getView方法中执行类似这样的操作

public View getView(int position, View convertView, ViewGroup parent) {
        View v = convertView;
        ViewHolder viewHolder;
        if (convertView == null) {
            LayoutInflater li = (LayoutInflater) mContext
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = li.inflate(R.layout.my_layout, null);
            viewHolder = new ViewHolder(v);
            v.setTag(viewHolder);

        } else {
            viewHolder = (ViewHolder) v.getTag();
        }

        viewHolder.mAppName.setText("SomeText");
        viewHolder.mAppImage.setImageDrawable(R.drawable.someImage);
        animation = AnimationUtils.loadAnimation(mContext, R.anim.my_animation);
        v.startAnimation(animation);
        return v;
    }

Answer 5

我的用例只是显示更多或更少的文字。因此，要从2-6个最大行切换列表视图项的状态，例如，可以执行此操作。它也动画了。动画看起来不是很平滑但是......

$original_sentence = "i am a simple sentence";
$words = explode( " ", $original_sentence );
shuffle($words);
echo implode(" ",$words);

使用动画展开ListView项

5 个答案: